CIL pulls unnecessary dependencies via matplotlib

[samtygier-stfc]

Description

Installing the CIL via conda e.g. with
conda create --name cil -c conda-forge -c https://software.repos.intel.com/python/conda -c ccpi cil=24.1.0
installs some unnecessary dependencies.

This is because it depends on matplotlib which is a metapackage that depends on pyside6 (or pyqt depending on the version) and tornado. In many cases a user will not need these (or may want to work with a different Qt version).

In the case of Mantid Imaging this results in our environment getting both Qt5 and Qt6.

This could be avoid by switching the dependency to matplotlib-base, or dropping matplotlib as a mandatory dependency.

Environment

24.1.0 -1 3.12.6 | packaged by conda-forge | (main, Sep 22 2024, 14:16:49) [GCC 13.3.0] linux